Arachnids rhymes with:
synod's, acids, antacids, ballads, bicuspids, coloreds, desmids, fluids, gorrids, harrod's, harrods, hatreds, hundreds, hybrids, invalids, likud's, limited's, liquids, methods, miracid's, muhammad's, orchids, period's, periods, pleiads, preferreds, rapids, salads, solids, synod's, united's
Arachnids sounds like:
aerosmith's, archimedes, argonaut's, argonauts, argument's, arguments, arraignments, arrowsmith's